quiescent (adj.)

• abeyant
• abiding
• calm
• changeless
• cloistered
• constant
• contemplative
• continuing
• cool
• do-nothing
• dormant
• durable
• dwindling
• echoless
• enduring
• firm
• fixed
• frozen
• halcyon
• hushed
• idle
• immobile
• immutable
• impassive
• inactive
• inaudible
• inert
• intact
• inviolate
• isolated
• laissez-faire
• lasting
• meditative
• moldering
• motionless
• mousy
• neuter
• neutral
• noiseless
• pacific
• paralytic
• paralyzed
• passive
• peaceable
• peaceful
• permanent
• perpetual
• persistent
• placid
• potential
• quiet
• remaining
• reposeful
• restful
• resting
• rigid
• secluded
• sedentary
• sequestered
• sheltered
• silent
• smooth
• solid
• soundless
• stable
• stagnant
• standpat
• static
• stationary
• steadfast
• still
• stilly
• stoic
• stolid
• sustained
• torpid
• tranquil
• unagitated
• unaltered
• unarticulated
• unchangeable
• unchanged
• unchanging
• unchecked
• undisturbed
• unfading
• unfailing
• unhearable
• unmoved
• unperturbed
• unruffled
• unsounded
• untroubled
• unuttered
• unvaried
• unvarying
• unvoiced
• vegetative
• waning